Update UserRepository class.

From Java to Kotlin. Also delete the SortDirection attribute (avoid conditionals checks).

rocket-chat-core/src/main/java/chat/rocket/core/repositories/UserRepository.java

-package chat.rocket.core.repositories;
-
-import com.hadisatrio.optional.Optional;
-import io.reactivex.Flowable;
-
-import java.util.List;
-import chat.rocket.core.SortDirection;
-import chat.rocket.core.models.User;
-
-public interface UserRepository {
-
-  Flowable<Optional<User>> getCurrent();
-
-  Flowable<List<User>> getSortedLikeName(String name, SortDirection direction, int limit);
-}

rocket-chat-core/src/main/java/chat/rocket/core/repositories/UserRepository.kt

+package chat.rocket.core.repositories
+
+import com.hadisatrio.optional.Optional
+import io.reactivex.Flowable
+import chat.rocket.core.models.User
+
+interface UserRepository {
+
+    fun getCurrent(): Flowable<Optional<User>>
+
+    fun getByUsername(username: String): Flowable<Optional<User>>
+
+    fun getSortedLikeName(name: String, limit: Int): Flowable<List<User>>
+}
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